XP风格按钮(转自code project)

// XPButton.h : header file
class CXPButton : public CButton
{
DECLARE_DYNCREATE(CXPButton)
// Construction
public:
CXPButton();
CPen pBoundryPen;
CPen pInsideBoundryPenLeft;
CPen pInsideBoundryPenTop;
CPen pInsideBoundryPenRight;
CPen pInsideBoundryPenBottom;

CPen pInsideBoundryPenLeftSel;
CPen pInsideBoundryPenTopSel;
CPen pInsideBoundryPenRightSel;
CPen pInsideBoundryPenBottomSel;

CPen *pOldPen;
CBrush pFillActive;
CBrush pFillInactive;
CBrush *pOldBrush;
BOOL m_bOverControl;
BOOL m_bTracking;
BOOL m_bSelected;
CString strCaption;
// Attributes
public:

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CXPButton)
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
protected:
virtual void PreSubclassWindow();
//}}AFX_VIRTUAL

// Implementation
public:
BOOL Focus;
LRESULT afx_msg OnMouseLeave(WPARAM wparam, LPARAM lparam);
LRESULT afx_msg OnMouseHover(WPARAM wparam, LPARAM lparam);
void afx_msg OnMouseMove(UINT nFlags, CPoint point);
void DrawInsideBorder(CDC *pDC,CRect rect);
void DoGradientFill(CDC *pDC,CRect rect);
virtual ~CXPButton();

// Generated message map functions
protected:
//{{AFX_MSG(CXPButton)
// NOTE - the ClassWizard will add and remove member functions here.
//}}AFX_MSG

DECLARE_MESSAGE_MAP()
};

// XPButton.cpp : implementation file
//

#include "stdafx.h"
#include "XPButton.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CXPButton

IMPLEMENT_DYNCREATE(CXPButton, CButton)
//////////////////////////////////////////////////
// CMemDC - memory DC
//
// Author: Keith Rule
// Email: keithr@europa.com
// Copyright 1996-1999, Keith Rule
//
// You may freely use or modify this code provided this
// Copyright is included in all derived versions.
//
// History - 10/3/97 Fixed scrolling bug.
// Added print support. - KR
//
// 11/3/99 Fixed most common complaint. Added
// background color fill. - KR
//
// 11/3/99 Added support for mapping modes other than
// MM_TEXT as suggested by Lee Sang Hun. - KR
//
// This class implements a memory Device Context which allows
// flicker free drawing.

class CMemDC : public CDC {
private:
CBitmap m_bitmap; // Offscreen bitmap
CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
CDC* m_pDC; // Saves CDC passed in constructor
CRect m_rect; // Rectangle of drawing area.
BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.
public:

CMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()
{
ASSERT(pDC != NULL);

// Some initialization
m_pDC = pDC;
m_oldBitmap = NULL;
m_bMemDC = !pDC->IsPrinting();

// Get the rectangle to draw
if (pRect == NULL) {
pDC->GetClipBox(&m_rect);
} else {
m_rect = *pRect;
}

if (m_bMemDC) {
// Create a Memory DC
CreateCompatibleDC(pDC);
pDC->LPtoDP(&m_rect);

m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
m_oldBitmap = SelectObject(&m_bitmap);

SetMapMode(pDC->GetMapMode());
pDC->DPtoLP(&m_rect);
SetWindowOrg(m_rect.left, m_rect.top);
} else {
// Make a copy of the relevent parts of the current DC for printing
m_bPrinting = pDC->m_bPrinting;
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}

// Fill background
FillSolidRect(m_rect, pDC->GetBkColor());
}

~CMemDC()
{
if (m_bMemDC) {
// Copy the offscreen bitmap onto the screen.
m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
this, m_rect.left, m_rect.top, SRCCOPY);

//Swap back the original bitmap.
SelectObject(m_oldBitmap);
} else {
// All we need to do is replace the DC with an illegal value,
// this keeps us from accidently deleting the handles associated with
// the CDC that was passed to the constructor.
m_hDC = m_hAttribDC = NULL;
}
}

// Allow usage as a pointer
CMemDC* operator->()
{
return this;
}

// Allow usage as a pointer
operator CMemDC*()
{
return this;
}
};

CXPButton::CXPButton()
{
pBoundryPen.CreatePen(PS_INSIDEFRAME|PS_SOLID,1,RGB(0,0,0));
pInsideBoundryPenLeft.CreatePen(PS_INSIDEFRAME|PS_SOLID,3,RGB(250,196,88));
pInsideBoundryPenRight.CreatePen(PS_INSIDEFRAME|PS_SOLID,3,RGB(251,202,106));
pInsideBoundryPenTop.CreatePen(PS_INSIDEFRAME|PS_SOLID,2,RGB(252,210,121));
pInsideBoundryPenBottom.CreatePen(PS_INSIDEFRAME|PS_SOLID,2,RGB(229,151,0));
pFillActive.CreateSolidBrush(RGB(222,223,236));
pFillInactive.CreateSolidBrush(RGB(222,223,236));

pInsideBoundryPenLeftSel.CreatePen(PS_INSIDEFRAME|PS_SOLID,3,RGB(153,198,252));
pInsideBoundryPenTopSel.CreatePen(PS_INSIDEFRAME|PS_SOLID,2,RGB(162,201,255));
pInsideBoundryPenRightSel.CreatePen(PS_INSIDEFRAME|PS_SOLID,3,RGB(162,189,252));
pInsideBoundryPenBottomSel.CreatePen(PS_INSIDEFRAME|PS_SOLID,2,RGB(162,201,255));

m_bOverControl = m_bTracking = m_bSelected = Focus = 0;
}

CXPButton::~CXPButton()
{
// TODO: Cleanup your control's instance data here.
pBoundryPen.DeleteObject();

pFillActive.DeleteObject();
pFillInactive.DeleteObject();

pInsideBoundryPenLeft.DeleteObject();
pInsideBoundryPenRight.DeleteObject();
pInsideBoundryPenBottom.DeleteObject();
pInsideBoundryPenTop.DeleteObject();

pInsideBoundryPenLeftSel.DeleteObject();
pInsideBoundryPenTopSel.DeleteObject();
pInsideBoundryPenRightSel.DeleteObject();
pInsideBoundryPenBottomSel.DeleteObject();
}

BEGIN_MESSAGE_MAP(CXPButton, CButton)
//{{AFX_MSG_MAP(CXPButton)
// NOTE - the ClassWizard will add and remove mapping macros here.
//}}AFX_MSG_MAP
ON_WM_MOUSEMOVE()
ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CXPButton message handlers

void CXPButton::DoGradientFill(CDC *pDC, CRect rect)
{
CBrush pBrush[64];
int nWidth = (rect.right) - (rect.left);
int nHeight = (rect.bottom) - (rect.top);
CRect rct;
for (int i=0; i<64; i++)
{
if(m_bOverControl)
{
if(Focus)
{
pBrush[i].CreateSolidBrush(RGB(255-(i/4), 255-(i/4), 255-(i/3)));
}
else
{
pBrush[i].CreateSolidBrush(RGB(255-(i/4), 255-(i/4), 255-(i/5)));
}
}
else
{
if(Focus)
{
pBrush[i].CreateSolidBrush(RGB(255-(i/3), 255-(i/3), 255-(i/4)));
}
else
{
pBrush[i].CreateSolidBrush(RGB(255-(i/3), 255-(i/3), 255-(i/5)));
}
}
}

for (i=rect.top; i<nHeight+2; i++)
{
rct.SetRect (rect.left, i, nWidth+2, i + 1);
pDC->FillRect (&rct, &pBrush[((i * 63) / nHeight)]);
}

for (i=0; i<64; i++)
{
pBrush[i].DeleteObject();
}

}

void CXPButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item
CDC* ppDC = CDC::FromHandle(lpDrawItemStruct->hDC);
CMemDC pDC(ppDC);
CRect rect = lpDrawItemStruct->rcItem;
UINT state = lpDrawItemStruct->itemState;
CPoint pt;
CString strText;
CString &m_title = strText;

GetWindowText(strText);

// draw the control edges (DrawFrameControl is handy!)

pt.x = 10;
pt.y = 10;

pOldPen = pDC->SelectObject(&pBoundryPen);

pDC->RoundRect(rect,pt);
if(state & ODS_FOCUS)
{
Focus = TRUE;
m_bSelected = TRUE;
}
else
{
m_bSelected = FALSE;
Focus = FALSE;
}

if (state & ODS_SELECTED || state & ODS_DEFAULT )
{
//pDC->DrawFrameControl(rect, DFC_BUTTON, DFCS_BUTTONPUSH | DFCS_PUSHED);
Focus = TRUE;
}
else
{
// pDC->DrawFrameControl(rect, DFC_BUTTON, DFCS_BUTTONPUSH);

}

pDC->SelectObject(pOldPen);
// Deflate the drawing rect by the size of the button's edges
rect.DeflateRect( CSize(GetSystemMetrics(SM_CXEDGE), GetSystemMetrics(SM_CYEDGE)));
// Fill the interior color if necessary

if (m_bOverControl)
{
pOldBrush = pDC->SelectObject(&pFillActive);
//pDC->FloodFill(rect.left+5,rect.top+5,RGB(0,0,0)); //pDC->FillSolidRect(rect, RGB(255, 255, 0)); // yellow
DoGradientFill(pDC,rect);
}
else
{
pOldBrush = pDC->SelectObject(&pFillInactive);
//pDC->FloodFill(rect.left+5,rect.top+5,RGB(0,0,0)); //pDC->FillSolidRect(rect, RGB(0, 0, 255)); // yellow
DoGradientFill(pDC,rect);
}
if(m_bSelected || m_bOverControl)
{
DrawInsideBorder(pDC,rect);
}
pDC->SelectObject(pOldBrush);

// Draw the text
if (!m_title.IsEmpty()/*!strText.IsEmpty()*/)
{
CSize Extent = pDC->GetTextExtent(m_title/*strText*/);
CPoint pt( rect.CenterPoint().x - Extent.cx/2,
rect.CenterPoint().y - Extent.cy/2 );

if (state & ODS_SELECTED)
pt.Offset(1,1);

int nMode = pDC->SetBkMode(TRANSPARENT);
//pOldPen = pDC->SelectObject(pBoundryPen);
//CFont *pOldFont = SelectStockFont( pDC );

if (state & ODS_DISABLED)
pDC->DrawState(pt, Extent, m_title/*strCaption*/, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
else
pDC->TextOut(pt.x, pt.y, m_title/*strCaption*/);
//pDC->SelectObject(pOldPen);
//pDC->SelectObject(pOldFont);
pDC->SetBkMode(nMode);
}

return;

}

void CXPButton::PreSubclassWindow()
{
// TODO: Add your specialized code here and/or call the base class
ModifyStyle(0, BS_OWNERDRAW);
CButton::PreSubclassWindow();
}

void CXPButton::DrawInsideBorder(CDC *pDC, CRect rect)
{
CPen *left, *right, *top, *bottom;
if(m_bSelected && !m_bOverControl)
{
left = &pInsideBoundryPenLeftSel;
top = &pInsideBoundryPenTopSel;
right = &pInsideBoundryPenRightSel;
bottom = &pInsideBoundryPenBottomSel;
}
else
{
left = &pInsideBoundryPenLeft;
top = &pInsideBoundryPenTop;
right = &pInsideBoundryPenRight;
bottom = &pInsideBoundryPenBottom;
}

CPoint oldpoint = pDC->MoveTo(rect.left,rect.bottom-3);
pOldPen = pDC->SelectObject(left);
pDC->LineTo(rect.left,rect.top+2);
pDC->SelectObject(right);
pDC->MoveTo(rect.right-1,rect.bottom-3);
pDC->LineTo(rect.right-1,rect.top+2);
pDC->SelectObject(top);
pDC->MoveTo(rect.left+2,rect.top);
pDC->LineTo(rect.right-2,rect.top);
pDC->SelectObject(bottom);
pDC->MoveTo(rect.left+2,rect.bottom);
pDC->LineTo(rect.right-2,rect.bottom);
pDC->SelectObject(pOldPen);
pDC->MoveTo(oldpoint);
}

void CXPButton::OnMouseMove(UINT nFlags, CPoint point)
{
if (!m_bTracking)
{
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
tme.hwndTrack = m_hWnd;
tme.dwFlags = TME_LEAVE|TME_HOVER;
tme.dwHoverTime = 1;
m_bTracking = _TrackMouseEvent(&tme);
}
CButton::OnMouseMove(nFlags, point);

}

LRESULT CXPButton::OnMouseHover(WPARAM wparam, LPARAM lparam)
{
m_bOverControl=TRUE;
Invalidate();
return 1;
}

LRESULT CXPButton::OnMouseLeave(WPARAM wparam, LPARAM lparam)
{
m_bTracking = FALSE;
m_bOverControl = FALSE;
Invalidate(FALSE);
return 0;
}